Action Pumps LtdTel: 023 9226 8511

1" BSPF to bepiped to drain

Top floor

WASP cold water riser system saverWater Air Surge Protection valve

· Automatic Surge ProtectionThe unique WASP valve incorporates as standard,three design features to automatically protectbuilding risers under all operating conditions, fromthe destructive surge and water hammerphenomena.These features are independent of any mechanicaldevices ensuring reaction in a very low milli secondtime span.· Vacuum ProtectionThe WASP valve utilises the large orifice to admitair in the riser thus preventing vacuum occurringwhen the booster set is down (powered off).· Effective Air ReleaseDuring filling, air is forced through an "Anti-Surge” orifice resulting in the deceleration of theapproaching water column due to the resistance ofrising air pressure in the valve. This dampenspotential pressure transients when the air valvecloses. The WASP valve design, ensures effectivede-aeration under all pipeline flow and operatingconditions, via either one of three dischargeorifices.

PIPE SYSTEM PROTECTOR!Dampens effect of Water-Hammer at pump start-upProvides Vacuum Protection when the pump stopsand the riser drains

TYPICAL ARRANGEMENTThe WASP valve must be installed at the top of each riser to ensureadequate water-hammer protection.An isolating valve should be installed to facilitate maintenance.

IMPORTANT NOTETo ensure proper operation the system must be thoroughly flushed prior tothe installation of the WASP valve.

Action Pumps LtdTel: 023 9226 8511

A

D

C

B

E

Size—mm/in. 25 / 1”

Pressure rating PN10*

A 337mm

B 317mm

C 95mm

D 1” BSPF

E 1” BSPF

Weight 4.6 kg

Max. riser pipe diameter 200mm**

WRAS No. 0904082

Min. pressure 0.3 Bar

Max. temperature 70°C/158°F

Min. temperature 4°C/40°F

* Versions rated at higher pressures up to PN40 available on request.** The design, size and use of every cold water riser /distribution laterals is different for all buildings, hence to size awater / air surge protection valve correctly, the system should be evaluated to determine the maximum flow rate ofair entering the system under vacuum conditions. In reality this is virtually impossible to estimate, so the figurestated is based on a maximum vacuum not exceeding 0.1 bar (riser draw down flow rate of approximately 55m³/hr.System fill - We strongly recommend that all booster pump set control systems utilise a “system fill” feature to assist with controlled slow filling of a system after a power failure or if the system pressure drops below a pre-determinedthreshold.